Table II.
Comparison between the mask group and control group in the patch test results
| Patch test items | Induced by mask (n = 27) | Induced by other causes (n = 70) |
|---|---|---|
| 1. Nickel (II) sulfate hexahydrate | 15 (55.55%) | 31 (44.28%) |
| 2. Lanolin alcohol (wool alcohol) | 1 (3.70%) | 2 (2.85%) |
| 3. Neomycin sulfate | 0 | 2 (2.85%) |
| 4. Potassium dichromate∗ | 7 (25.92%) | 7 (10%) |
| 5. Mercury ammonium chloride | 0 | 5 (7.14%) |
| 6. Fragrance mix I | 1 (3.70%) | 6 (8.57%) |
| 7. Colophonium | 1 (3.70%) | 2 (2.85%) |
| 8. Imidazolidinyl urea | 0 | 1 (1.42%) |
| 9. Clinquinol | 0 | 1 (1.42%) |
| 10. Myroxylon pereirae resin (Balsam Peru) | 2 (7.40%) | 4 (5.71%) |
| 11. IPPD | 2 (7.40%) | 0 |
| 12. Cobalt (II) chloride hexahydrate | 3 (11.11%) | 2 (2.85%) |
| 13. PTBP∗ | 4 (14.81%) | 0 |
| 14. Paraben mix | 1 (3.70%) | 0 |
| 15. Captan | 2 (7.40%) | 3 (4.28%) |
| 16. Budesonide | 0 | 2 (2.85%) |
| 17. Methylisothizolinone + methylcholoroisothizolinone | 0 | 1 (1.42%) |
| 18. Quaternium-15 | 1 (3.70%) | 0 |
| 19. MBT | 0 | 1 (1.42%) |
| 20. PPD | 0 | 7 (10%) |
| 21. Formaldehyde | 3 (11.11%) | 2 (2.85%) |
| 22. Mercapto mix | 1 (3.70%) | 1 (1.42%) |
| 23. Thimerosal | 4 (14.81%) | 5 (7.14%) |
| 24. Thiuram mix | 1 (3.70%) | 1 (1.42%) |
| 25. Tixocortol-21-pivalate | 0 | 1 (1.42%) |
IPPD, N-Isopropyl-N-pheynyl-4-phenylenediamine; MBT, 2-Mercaptobenzothiazole; PPD, p-phenylenediamine; PTBP, 4-tert-butylphenol-formaldehyde resin.
∗
P value < .05.